Enargite Mineral Data + Say ENARGITE


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General Enargite Information
Help on Chemical Formula: Chemical Formula: Cu3AsS4
Help on Composition: Composition: Molecular Weight = 393.82 gm
   Copper   48.41 %  Cu
   Arsenic  19.02 %  As
   Sulfur   32.57 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Cu3AsS4
Help on Environment: Environment: Moderate-temperature hydrothermal vein deposits. Late stage mineral in low temperature deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1850
Help on Locality: Locality: Butte, Montana, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek enarges - "obvious."
Help on Synonym: Synonym: ICSD 75556
  PDF 35-580
 

Enargite Image

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Enargite

Comments: Lustrous, metallic gray columnar crystals of enargite with minor quartz.
Location: Quiruvilca, La Libertad Dept., Peru. Scale: 4.2x2x2.3 cm.
© Isaias Casanova / IC Minerals
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Enargite   Famatinite

Comments: Violet metallic crystalline famatinite with black massive enargite.
Location: Cerro de Pasco, Pasco, Peru. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Enargite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8638:1:0.8288
Help on Cell Dimensions: Cell Dimensions: a = 6.41, b = 7.42, c = 6.15, Z = 2; V = 292.51 Den(Calc)= 4.47
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pnm21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.22(1), 1.859(0.9), 2.87(0.8),
Help on Forms: Forms:

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Forms: [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Adiwidjaja G , Lohn J , Acta Crystallographica, Section B , 26 (1970) p.1878-1879, Strukturverfeinerung von enargit, Cu3AsS4, Locality: Butte, Montana, USA

View Additional jPOWD Structure files for Enargite
[1]
 

Physical Properties of Enargite

Help on Cleavage: Cleavage: [110] Perfect, [100] Distinct, [010] Distinct
Help on Color: Color: Steel gray, Blackish gray, Violet black.
Help on Density: Density: 4.4 - 4.5, Average = 4.45
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Enargite

Help on RL Anisotrophism: RL Anisotrophism: Very strong, dark violet-red or olive green tones.
Help on RL Color: RL Color: Gray to light pinkish brown with deep red internal reflections.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Enargite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   27.50   30.00 
   
 420 nm   27.00   29.30 
 440 nm   26.50   28.60 
 460 nm   26.00   28.00 
 480 nm   25.60   27.40 
 500 nm   25.30   27.00 
 520 nm   25.10   26.60 
 540 nm   25.00   26.40 
 560 nm   25.10   26.40 
 580 nm   25.30   26.60 
 600 nm   25.70   27.00 
 620 nm   26.20   27.60 
 640 nm   26.80   28.30 
 660 nm   27.60   28.90 
 680 nm   28.20   29.60 
 700 nm   28.80   30.30 
Calculated Relative Intensity Colors of Enargite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 350%
R1                      
R2                      
 

Calculated Properties of Enargite

Help on Electron Density: Electron Density:

relectron=4.18 gm/cc
note: rEnargite =4.47 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00244
Boson Index = 0.99756
Help on Photoelectric: Photoelectric:

PEEnargite = 36.75 barns/electron
U=PEEnargite x relectron= 153.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Enargite is Not Radioactive
 

Enargite Classification
Help on Dana Class: Dana Class: 3.2.1.1 (3)Sulfides - Sulfosalts
  (3.2)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (3.2.1)Dana Group
 
3.2.1.1 Enargite Cu3AsS4 Pnm21 mm2
Help on Strunz Class: Strunz Class: II/C.14-10 II - Sulfides and sulphosalts
  II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1
  II/C.14 - Cubanite series
 
II/C.14-10 Enargite Cu3AsS4 Pnm21 mm2
 
II/C.14-15 Stibioenargite* Cu3(Sb,As)S4 Unk Ortho
 
II/C.14-20 Cubanite CuFe2S3 Pcmn 2/m 2/m 2/m
 
II/C.14-30 Sternbergite AgFe2S3 C mma 2/m 2/m 2/m
 
II/C.14-40 Argentopyrite AgFe2S3 Pmmn 2/m 2/m 2/m
 

Other Enargite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Enargite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 - HyperPhysics 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 -Mineralienatlas (Deutsch) 15 - Minerals of Wisconsin 16 - Philatelic Mineralogy 17 -QUT Mineral Atlas 18 - WWW-MINCRYST 19 -theimage 20 -École des Mines de Paris

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Enargite

Cu3AsS4
Dana No: 3.2.1.1 Strunz No: II/C.14-10
Locality:

 

Notes:

 
 
   
 
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